Heavy traffic will hit Windsor next week when the annual Institute of Groundsmanship (IoG) Saltex exhibition comes to the racecourse.
The event is an international trade fair which unveils the latest equipment for maintaining sports grounds, children's play areas as well as software and security equipment.
Visitors from all over the world range from groundsmen and greenkeepers to architects, designers and surveyors as well as leisure centre managers.
The fair runs at Windsor Racecourse on Tuesday, Wednesday and Thursday and congestion in and around the Maidenhead Road area is expected to last all day.
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Trains travelling to and from London Paddington are facing 'major disruption' this afternoon, with some services set to be delayed by up to an hour, cancelled or revised.